Lock



Feb, 6, 1934. JACOB] 1,945,779

LOCK

Filed May 8, 1933 ELM MM? 5mm Jimb/ EMZ Patented Feb. 6, 1934 UNITED STATES PATENT OFFICE;

LOCK

Application May 8, 1933. Serial No. 669,859

4 Claims.

-. This invention relates to certain new and useful improvements in locks and is a continuation in part of the co-pending application of (Edward N.

Jacobi, Serial No. 480,376, filed September 8th, 1930.

As in the aforesaid application, it is a general object of this invention to provide an improved construction for removable cylinder looks.

The type of locks to which the present invention refers, embodies a bayonet joint or other comiection at the inner end of the lock cylinder which requires the cylinder to be in a predetermined position of rotation with respect to the casing during removal and insertion of the cylinder, and in which stop means are provided to normally prevent movement of the cylinder to such releasing position.

It is, therefore, a particular object of this invention to provide improved and simplified stop means to prevent movement of the cylinder to its releasing position. 1

With the simplification of this feature of the structure in mind, it is a further object of this invention to provide a spring pressed stop which is held-in position by a cap or shell aflixed to the outer end portion of the casing.

And in this connection, it is anotherobject of this invention to provide a single cap or shell to serve both as a finishing face for the lock and as l a means to retain the stop pin in place.

With the above and other objects in view which will appear as the description proceeds, my invention resides in the novel construction, combination and arrangement ofv parts substantially as hereinafter described and more particularly defined by the appended claims, it being understood that such changes in the precise embodiment of the hereindisclosed invention may be made as come within the scope of the claims.

In the accompanying drawing, I have illustrated one complete example of the physical embodiment of my invention constructed according -to the best mode I have so far devised for the practical application of the principles thereof and in which:

Figure l is a perspective view looking 'into the front end of a lock casing embodying this invention;

Figure 2 is a perspective view of the lock cylinder which is insertable into the casing;

Figure 3 is a view partly in side elevation and partly in section of the assembled lock illustrate ing the relationship of the lock cylinder stops and the spring pressed stop of the casing; and

Figure 4 is a view partly in side elevation and partly insection illustrating a slightly modified construction of the lock casing.

Referring now more particularly to the accompanying drawing in which like numerals indicate like parts throughout the several views, the 00 numeral 5 designates a lock casing having a bore 6 closed at its inner end by an adaptor 7 which is rotatably mounted in the casing. The outer or front end of the bore 6 is openrand is provided with a counterbore 8 by which a shoulder 15 9 is formed. Communicating with the bore v6 and formed in diametrically opposite portions of the casing are two tumbler receiving grooves 10, the front ends of which open to the counterbore 8.

As is customary, the grooves 10 are adapted to 70 receive the ends of the tumblers 11 carried by the cylinder 12 which is insertable into the bore 6. The innermost end of the cylinder has an eccentric cam 13 projected therefrom to be drivingly engaged with the adaptor '7. Also formed in the inner end portion of the cylinder is a bayonet slot indicated generally by the numeral 14 and comprising a circular groove 15 extending partially about the cylinder and a longitudinal recess 16 forming an entrance to the circular groove. The entrance 16 is adapted to permit the passage of a lug 17 carried by the casing and projecting intoits bore 6, into and out of the circular groove 15. 7 After being engaged in the bayonet slot, the lug 17 positively retains the cylinder against withdrawal from the casing except when the cylinder is turned, to align the recess or entrance 16 with the lug.

After the cylinder is properly assembled with the casing, it is normally prevented from being turned to its releasing position by a stop pin 18 carried by the casing and cooperating with two abutments 19 and 20 formed on the cylinder. The abutments 19 and 20 are provided by cutting back an enlarged flange 21 formed on the front end of the cylinder and received in the counterbore 8 of the casing when the cylinder is assembled therewith.

The flange 21 is preferably provided with a finm0 ishing plate or cap 22 so as to afford a neat finished surface without necessitating polishing the die-cast metal of which the cylinder is formed.

The abutments 19 and 20 are substantially diametrically opposite and by engaging the opposite sides of the stop pin 18 limit the rotation of the cylinder to substantially one hundred and eighty degrees. Throughout this normal range of movement, of the lock cylinder, the retainin 11o lug 17 remains in the circular groove of the bayonet slot.

To release the cylinder for removal requires rotation of the cylinder beyond one of its nor- 5 mal limits and for this purpose, the stop pin 18 is depressible to enable it to be moved out of the path of one of the cylinder abutments.

An expansive spring 23, confined between the inner end of the stop pin and the bottom of the bore 24 in which the pin is mounted, yieldably projects the pin to its operative position. pin is held against disassembly from the cylinder by a sheet metal finishing cap 25 fixed to the outer end of the casing with its outermostwall'26 overlying the outer end of the stop pin. The casing wall 26 thus affords convenient means for limiting the outward projection of the pin by its spring 23.

The finishing cap 25, like the cap 22, on the cylinder, has as its object besides holding the stop fpin in place,f .to afford a neat external surface without necessitating polishing the die-cast metal of which the casing is formed and may be of different constructions and shapes to suit the casing.

The casing illustrated in Figures 1, 2 and 3 is provided with an enlarged flange 27 at its outer or front end and the finishing cap 25 has its peripheral edge 28 spun over the flange 27 as shown. The finishing cap may also be pressed on the outer end of thecasing as illustrated in Figure 4. s

When it is desired to depress the pin 18 and move the cylinder to its releasing position, the cylinder is turned to engage its abutment 19 with the pin. In this position, a recess 29 formedin the flange 21 and cap 22 of the cylinder is aligned *with the pin 18 so as to afford access to the pin and permit the insertion of a tool by which the depression of the pin may be effected.

7 If desired, a tool such as shown in the aforementioned co-pending application, which embodies a part engageable with the usual key 30 and a pin carried thereby to project through the recess 29, may be employed or, if desired, merely a piece -0f wire may be projected into the recess to effect the desired depression of the pin 18.

' --I-Iaving depressed the pin to clear the abut ment 19, the cylinder may be turned to its posi- "tion aligning the recess 16 withthe lug 17.

' It is observed that when the cylinder is'properlyassembled with the casing, the end of the stop pin 18 bears against the shoulder 31 formed by the stepped or cut-back portion of the flange 21; and it is also observed that the shoulder 31 continues past the recess 29 and that the recess 29 is of smaller diameter than the pin-18 so that when the cylinder is in its position defined by the engagement of its abutment 19 with the pin, the

pin will not project through the recess.

nection with the accompanying drawing, it will be readily apparent to those skilled in the art that this invention affords novel and simplified means for defining the normal limits of rotation of the to the utilization of the finishing cap on the casing to retain the stop pin in position.

What I claim as my invention is:

1. In a lock structure of the character described, including a bored casing and a key controlled lock cylinder within the casing and removable s-therefrom when in av predetermined position-with respect to the casing, means for preventing movement of the lock cylinder to said predetermined position comprising, a yieldable abutment carried by the casing adjacent the mouth of its bore, a finishing cap engaged over the outer end of the casing and having a part overlying the abutment to retain the same in position, and a second abutment carried by the lock cylinder and engageable with the casing carried abutment, said yieldable casing carried abutment being movable to enable passage of said abutments past each other.

2. In a lock structure of the character described, including a bored casing and a key controlled lock cylinder within the casing and removable therefrom when .in a predetermined position with respect to the casing, means for preventing movement of the lock cylinder to said predetermined position comprising, a pin mounted in an aperture in the casing adjacent the mouth of its bore, a spring to yieldably projectthe pin outwardly of said aperture, a cap secured over the outerend. portion of the casing and having a part overlying the outer end of the pin to hold the same in its aperture, and an abutment carried by the cylinder and engageable with the pin, "said pin .being depressible against the action of its spring to enable the lock cylinder abutment to pass the same.

3. In a lock of the character described, including a bored casing and a key controlled lock cylinder within the casing bore and removable therefrom when'in a predetermined position with I respect to the casing, means for preventing :movement oitlielock cylinder to said predeteranined position comprising cooperating abutlments carried by the casing and the lock cylinder, said casing carried abutment comprising a pin slidably mounted in an aperture in the casing, a

lspring. to yieldably project the pin from the apertureinto its normal'operative position, and a ,wall fixed tothe outer end portion of the casing and overlying the 'outer end of the pin to limit *itsoutward' projection by the spring, said pin being depressible to'enable the lock cylinder abutment topass the same.

14. In a lock including a bored casing and a key controlledlock cylinder therein, means to define thenormal limitsof rotation of the lock cylinder -in the.casing comprising, spaced abutments on :the' lock cylinder and a movable abutment carried by the casing and yieldably projected to its operative position, and a sheet metal cap env gaged over the casing, and having a part engage- From the foregoing description taken in conable with the yieldable abutment to hold the same assembled with the. casing, said yieldable abutclock cylinderfor rotation beyond one of its norcylinder in a removable cylinder lock, andthat the simplicity of the structure is primarily due mallimits of rotation. 1

EDWARD N. JACOBI.

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